JSC2011-E-040315 (29 March 2011) --- NASA astronaut Chris Ferguson, STS-135 commander, undergoes a fit check of his Sokol spacesuit at the Zvezda facility on March 29, 2011, in Moscow. The crew of the final shuttle mission traveled to Moscow for a suit fit check of their Russian Sokol suits that will be required in the event of an emergency. Photo credit: NASA Photo/Houston Chronicle, Smiley N. Pool